Rotary stencil-duplicating machine



@,somss Nov; 16 1926.'

. E. J. BRASSEUR RoTARY-sTNc1L DUPLICATING MACHINE l Filed Ooi. s. 1925 fr sheetsshet 1 ATTONEY E. J. BRASSEUR ROTARY STENGIL DUPLICATING` MACHINE Nw. 16 ,1925; l1,607,386

.` INVENTOR @en Nov. 16 1926. 1,607,386

E. J. BRAssEUR ROTARY STENCIL DUPLICATING MACHINE Filed oct.' :5, 1925 7 sheets-sheet' ATroRNEY Nov. 16 1926. 1,607,386 A I E. J. BRASSEUR- ROTARY s'rENcIL DUPLICATING MACHINE Filed Oct. 5. 1925 V7 Sheets-She'e'i'. 4

za il A ATTORNEY Nov. 16 11926.

E. J. BRAss1-:UR ROTARY STENCIL DUPLICATING MACHINE I Fi1ed out. s, 1925 7 sheets-sheet" .5

@f M' 12 w VENTOR ATTORNEY Nov. 16 192..

E J. BRAssEUR n ROTARY-STENCIL DUPLICATING MACHINE Filed Oct. 3 1925 Nov; 1e 192e.' 1,607,386

E. J. BRAssr-:UB

ROT'ARY STENCIL DUPLULTINGA MACHINE Filed 00. 5. 1925 7 Sheets-Sheetl '7 Patented Nov. 16, 1926.

UNITEDy srarizsI PATENT OFFICE.

ERNEST J. BRASSEUR, OF CHICAGO, ILLINOIS, ASSIGNOR TO A. B. DICKCOMPANY, OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS. I

ROTARY STENCIL-DUPLICATING MACHINE.

Application led October 3, 1925. Serial No. 60,158.

This invention relates to rotary stencil duplicating machines.

One of the principal objects of this invention is directed to an improvement in the manner of attaching an ink padv to the machine, and is to provide a construction-so constituted that a pad may be replaced on the machine readily and easily without the operator ltouching any ink-carrying surface,

and consequentlyA without dirtying the hands. Another object of this invention is to provide means for so holding av pad in place on from going beyondthe edge of the pad and dirtying other parts of the machine. A further object is to provide pad retaining means which permit the pad to be reversed on the machine, thus extending the life of the pad. The objects of this invention also include the provision of -pad retaining means which permit adjustment of the pad on the cylinder. A

Another principal obj ect of this invention is to provide improved means for holding a stencil sheet on the pad and cylinder, and to provide clamping means which function to prevent' ink from going beyond the edgef of the stencil and dirtying adjacent parts of the machine; to relieve the strain between the stencil stub and the buttons engaging the same ;.to relieve the stub of the stencil sheet vfrom shock as the rubber rollerv contacts therewith; also to prevent chaing contact of r the rubber roller against the stencil sheet, and at the same time to provide a properly located knife edge which facilitates the tearing off of therstencil backing sheet.

Another object of this invention is to provide improved ho'ok meansfor'engaging the stencil stub, permitting the stencil sheet to be more readily and easily attached to' and removed from the machine, and 'permitting adjustment of the'stencil lengthwise and angularly with respect to the dia-- phra l l 'A further object of this invention .is to provide pad attaching and stencil engaging means for errors in location of written matter on the stencil.

A` further object of thisinvention is to provideimproved pad and stencil attachment means lof the character described which may be applied to rotary duplicating mathe machine that ink is preventedwhich are adjustable vto compensateA struction. v A further object chines which are otherwise of standard conof this invention includes the provision of improved means for locking the printing cylinder against rotation is adjustable so as condition.

to be'kept in leak-proof Another object of my invention is to provide a shield or guard for protecting the shaft bearing of the trough\ or, in other words, as an additional protection in conjunction with the packing from leaking.

Other objects of this invention will be in part obvious and in part pointed out hereinafter.

In accordance with this invention, the ink pad comprises a sheet of suitable fabric having securely and permanently attached at each end al metallic plate provided with perforations.

The attachment plates on each end of the sheet are alike, so that the -pad can be turned over and reversed on the machine, and in consequence .of this feature the'A life of the pad may be extended. j. The means for retaining this pad on the cylinder include fingersv which engagethe stub at the leading which engage the end -of the pad and hooks stub of the pad' at thel trailing end. At the leading end, the fabric` of the pad passes over a bevel edge on the end of the diaphragm.- Adjustable hook means are provided for engaging vthe stub of a conventional stencil sheet, with the fabric of the sheet resting on the ink pad and passing bevond the beveled edge of the diaphragm.- The leading edge of the pad andthe stencil sheetare engaged andclampedV tightly between the stationary bevel edge of the diaphragm and a bevel edge of a movable plate,

whereby the strain is relieved,

between the stencil sheet stub and the said hooks,

and the ink .is prevented from going beyond the line across which the stencil and The movable plate protects the stencil from shock and chafing by pad are clamped.

the rubber roller during operation of the y machine. This bevel edge of the plate also establishes a knife edge across which the 'backing of the stencil sheet may be torn,

The said stencil hook means are adjust-- able toward and from the diaphragm and also angularly with respect thereto to permit similar adjustment of the stencil on the cylinder.

The above and other features of the construction will be described fully Aand in detail hereinafter. y

In order that a clearer understanding of this invention may be had, attention is hereby directed to the accompanying drawings, forming a part of this application and illustrating certain possible embodiments of the invention.

Referring to the drawings: Fig. 1 is a view, partly in section and partly in elevation, of a portion of a rotary stencil-duplicating machine in which the invention has been embodied, this view being taken substantially on the line 1-1 of Fig. 2; Fig. 2 is a top View of the same; Fig. 3'is a sectional viewt'radially 'through the cylinder, and is taken on the line 3 3 of Fig. 2, a pad and, stencil being shown engaged on the cylinder; Fig. 4 is a re'petition of a portion of Fig. 3, but shows 4the clamping means in retracted or releasing position; Fig. 5 is a sectional view of an end fragment of the pad and its attachment plate. and is taken on the line 5-5 of Fig. 12: Fig. 6 is a sectional view of a portion of the cylinder, and is taken on the line 6-6 of Fig. 2; Fig. 7 is a sectional View taken on theline 7-7 of Fig. 6; Fig. 8 is a sectional view of a fragment of the machine showing the means for engaging the trailing end of the pad and showing the movable clamping plate in retracted position` as on 8-8` of Fig. 2: Fig.

- 9 is a sectional view of a detail. and is taken on the line 9 9 of Fig. 6: Fig. 1() is a side view of the cylinder showing the means for locking the cylinder against rotation and is an elevation 'of the ink pad with itsend -attachment plates, the center of the pad being broken away; Fig. 13 is an enlarged detail View showing the slidabl'e mounting of one of the ngers which rests beneath the leading edge of a sheet of paper; Fig. 14 is a sectional view of a portion of a cylinder, in-

cluding a packing gland embodying my invention and an inkshield therefor, also embodying my invention, the view being taken on the line l14---14 of Fig. 15; and Fig. 15 is a sectional view ofthe same, and is taken on the line 15-15 of Fig.' 14. Similar reference characters refer to similar parts wall plates are provided with the usual cams 4 which control other parts of the machine. A-elosed compartment 5 is provided within vthe cylinder and behind the diaphragm 3,

and an ink trough 6 is suspended within this compartment by being rigidly secured to the shaft 7, about which the cylinder rotates. The cylinder is supported on suitable side brackets 8 and 9. vThe ink pad 10 is placed over the diaphragm 3, and the stencil sheet 11 is, placed over the pad in the usual position. When it is desired to apply ink to the pad, the trough 6A is tilted, by rocking a handle 12 secured to a shaft 12 which is connected with an end of the. rod 7 by colf lars 7 and 9', which have pin and slot engagement, as at 19. The'cylinder may be rotated by the usual handle 13, and during' this rotation the ink which has been spilled from the trough upon the diaphragm will spread thereover `and permeate into and through permanently attachedl to the sheet in the manner best shown in Fig. 5. that is, by first doubling the edge of the plate upon itself with the edge of the sheet in between, and then folding this double portion over again in such a way that a rounded edge15 of one of the folds of the plate extends beyond the extreme edge 16 of the plate. Y'Vith this ar rangement the sheet 10 does not contact any -ment strip 14. Each attachment strip is sharp edges of the plate but bears against the rounded edge 15, and thus is securely held without danger of being cut or ripped away. Each plate 14 is provided with a pair of perforations 17. to the rear ofwhich are tapered offset portions 18, which serveI to guideV the plates into engagement with engaging fingers or hooks mounted on the cylinder. Since plates 14 are alike, tlusheet may be turned over and reversed on the cylinder, and by periodically turning and reversing the sheet its life can be extended. l,

over and partially around it, with the edge of the plate 14 engaging beneath the rod. A pair of members 23 are pivotally mounted on the drum, each member 23 having preferably a series of hooks 244, which may be engaged selectively with one of theq Aperforations 17 of the trailing plate 14 of the pad to holdthis end of the pad securely on the cylinder. The provision of 'the series of hooks 24 permits the taking up of slack should the pad stretch.' To take up such slack, it is only necessary to engage a lower finger 24 of one or both devices 23 in the perforation in the plate 14. By this ar,

rangement, an inkingV pad can be readily and easily removed from-the machine without it being necessary for the operator to dirty his hands with ink froml the'pad. To

' detach a. pad, the operator grasps'the plate 14 at the trailing edge of the pad and disengages'this plate from the devices 23. The

operator then peels the pad from the cylin-A der, .and then,

by rotatingthe cylinder 'so that the fingers 21 are directedv downwardly, the operator need merely lower the other end of the pad and it-will automatically entirely free of the machine. In putting.

fall away from the. fingers 21, and' become a pad in place, the same operations are car ried out but in reversel order, that is, the operator grasps the plate at the trailing end of the pad and moves the pad to place -the leading plate into engagement with the fingers 21. Then he,` preferably rotates'the cylinder and simultaneously lowers the sheet to lay it over the diaphragm, andy then engages the trailing' plate 14 with thedevices 23. As will be clear, the operator may do all this without grasping any part ofv the pad except the plate `at the trailing edge of the pad. As noink isv allowed to get onto' this plate,

will be clean ofl ink.

The stencil stub 25 has the usual button# hole perforationsVand is engageable over hooks 26, carried on a plate 27 which isadjustablv mounted between the sidewalls of the cylinder. to an arm Y trate elongated slots 32 in a stationary-crossbar 33 attached at its ends tothe cylinder walls 1 and 2. A screw 34-is swiveled in the rear of eacharm. 30 and is in threaded engagement with a bracket 35' fixed to a "ery of the operators fingersA Each end ofplate'27 is fixed" 30, as by rivets 31, which penecross-bar 33 at each end. Thus, by turning the screw 34 whichl is adjacentcylinder wall 1, the adjacent end of plate'27 may be adjusted toward and from the adjacent end of the diaphragm. Similarly, by adjust# ing the `screw 34 which is near the cylinder wall 2, the corresponding end .of late 27 may be adjusted toward and from t e adja cent edge of the diaphragm. By properly adjusting both screws 34, a stencil sheet engaged over the buttons may be adjusted on the diaphragm into the most suitable position thereon. In order that the operator may readily ascertain whether the stencil stub and sheet are in proper alignment with the cylinder, each arm 30 has a pointed finger 36 bent over bracket 35, and each bracket 35 has a cooperating indicating mark 37, whereby the operator, by noting the relative positions of these fingers with respect to the marks 37, may readily and easily determine whether or not the plate V27 and the hooks thereon are parallel with the end of the diaphragm, and may eiect thisadjustment by adjusting the arms 30 into such positions that each finger 36 is in the same relative position to its cooperating indieating mark 37 las isthe finger of the other arm with respect toits cooperating mark.

Each arm 30 also has a finger 38 bent under bracket 35 .to coact with finger: 36 to provide a guide for each arm' on each bracket.

Mounted on each wall 1 and 2 is,a stud pin 40 onwhich is pivoted at one end an arm 41 which at its end has a vslot 42 through which extends a bolt 43 secured to the cylinder wall and having a. .washer and nut 44,

cof

whereby the arm 41 may be lockedin adjusted position on the cylinder.- Adjacent pin 40, arm 41 has an eccentric pin 45which pivotall-y supports an arm 46. The top portions 47 of arms 46 extendtoward the diaphragm. Extending between and rigidly secured to these top portions 47 is a platel 48 which has the same curvature as the periph-V the diaphragm. Plate 48 has a beveled edge 49. This edge may be taken edge 5() lprovided on the adjacent edge of the diaphragm 3, by causing arms-.46 to pivot on the stud 45. A rod 51 extends be-` tween and is secured to the opposite arms 46. )At the center 'of this rod is' engaged one end 52 of la toggle couple 53; the other end 54 of the toggle couple being pivoted on against or away from a complementary bevel YVall 61 has out outs 63 for the hooks 26, the

arrangement being such that when plate 48 is clamped against the diaphragm, the portions of wall 61 adjacent the hooks will move the stencil stub 25 home on the hooks 26 before the stencil sheet is clamped between the bevel edges a49 and 50.

The operation of the aforementioned clamping means is as follows :l vVhen an ink pad and stencil sheet are to be attached to the machine, the clamping means should be in retracted position, as shown in Fig. 4. The stencil pad is now engaged by causing the fingers 21 to engage in the perforations 17 of the pad attachment plate 14. The pad is then carefully laid on the diaphragm and its opposite end is secured by the attachment devices 23 in the manner heretofore described. The stencil sheet with its backing attached is then secured to the machine by engaging its stub over the hooks 26. The stencil sheet is then carefully laid over the pad. Tf adjustment of the stencil sheet is necessary, the hooks are adjusted by manipulating the screws 34 in the manner referred to above. Then the operator takes hold of linger 57 and presses the same inwardly toward the cylinder. This causes toggle couple 53 to become extended and at the same time causes the plate 48 to move edgewise toward the adjacent edge of the diaphragm and .nally to press tightly against the diaphragm edge to clamp the ink pad and stencil tightly between these edges. However, before this tight clamping has been effected, the member 61 will have engaged the stencil stub and will have pushed it home on the hooks 26. The function of. levers 41 is to raise or lower the surface of the plate 48 so that it will be always a little higher than the stencil irrespective of wear on the pivots or manufacturing errors.

Having clamped the stencil with its backing attached and the pad at this end of the diaphragm, thebacking of the stencil sheet may now be torn olf readily and easily along the knife edge presented by the end of plate 48 which is clamped thereagainst. As be- .fore stated, the top surface of plate 48 is raised just atrifle above the surface of the stencil sheet, so that as the machine operates j this plate will receive the shock from-the rubber roller, and also will protect. tli'e stencil sheet against chafng contact from this roller.

On the rear edge of plate 48are two downwardly extending lugs 65 which carry a bolt 66. From each end of bolt 66 extendsa bar 67 which at its other end is ivotally secured to one of the arms 46, and here is supplied with a mutilated collar 68 against which engages a spring 69 whereby the bar is held yieldably in either of two positions of rotation on the arm 46 and bolt 66. Each bar 67 carries -a slide 70 for ladjustment pivotable to allow these fingers to be placed against or away from the stencil sheet.

At the trailing end of the diaphragm is a movable plate 7 5 having at each side edge a pair of lugs 76 and 77. Mounted against lugs 76 and 77 is a dog 4v7 8 and opposite lug 7 6 on the opposite side of dog 78 is secured an arm 79 of a U-shaped bar, the top of which 80 extends across the cylinder, and the arms 79 being pivoted to the cylinder walls as at 81. Parts 76, 78 and 79`are connected by a pin 82.

Extending between the lugs 77vis a rod 83, which at its center is engaged by an end 84 lof a toggle couple 85. At its other end 86, this toggle is mounted' on a pin 87 supported on two brackets-88 which are attached to the top of the ink chamber. This toggle has a finger 89 for operating the same. A spring 90 is coiled around pin 82 and has its opposite ends engaging cross bar 80 and rod 83. This spring aids in taking the plate 75 against the diaphragm. The forward ends of dogs 78 are recessed to receive rod 22, thereby establishing a fulcrum about which the plate 75pivots when the toggle approaches fully extended posi-A tion and causes the end of plate 75 to clamp -the pad and stencil tightly and firmly against the diaphragm.

A guide member 91 is secured to one wall 2 of the cylinder, and a roller 93 is mounted on the outside of the adjacent dog 78 to ride on the surface 94 of the guide 91. This surfacefhas a depression 95 at its rear end in which the roller 93 is arrested when the plate 7 5 is in fully retracted position.

The operation of the clamping mechanism at this end of the ydiaphragm is as follows: The ink pad and stencil sheet having been laid on the cylinder and engaged at their leading ends in the manner above described, the plate 75 is takenfrom its retracted position (see Fig. 8) into its forward or clamping position (see Fig. 3), by the` operator taking hold of the toggle finger 89 and pressing this inwardly toward the cylinder to cause toggle 85 to become extended. During this movement of the toggle couple, the forward edge of plate 75 is taken over the adjacent edge of the diaphragm and the ink pad and stencil sheet thereon. This movement accompanies the movement of swinging pivot 79v and until further movement of this swinging pivot is prevented by the dogs 78 comingin contact with the rod Then further extension of the toggle couple will cause the plate 75 to pivot on the pivots 82 in such a way that the rear edge of the plate will rise and the forward edge will be tightly pressed 'against the diaphragm' and will clamp the ink pad and the stencil sheet tightly between the plate and the diaphragm. ,'To retract plate 75 to permit removal of a stencil sheet or an ink pad, it is only necessary for the operator to grasp toggle finger 89, and, by pulling this finger outwardly of the cylinder, cause the toggle couple to collapse, with the consequent withdrawal ofthe plate from the diaphragm.

When the toggle couple is in fully collapsed condition, the rollers 93 forming a part of.l this clamping mechanism will automatically.

become located in the recesses 95 of the guide members 91,.&nd the clamping mecha nism will be yieldingly held -in retracted psition.

' usual ianges 100, vthen in order to permit the attachment of these assemblies tot the machine, the ianges 100 may be cut away as at 101. This will ermit of the insertion of the assembly units into their proper positions between the cylinder walls. Then these cut away portions may b filled with removable inserts 102 and 103, which may be removably secured to the cylinder walls as by screws 104 and 105. One insert 102 may, if desired, carry the conventional crank button 106 used to connect the cylinder with automatic driving means in -the usual manner.

Inserts 103 are preferably integral with so guide members 91.

Counterbalance weights 107 may be se. cured to the cylinder walls to properly balance the cylinder.

There .is also A illustrated herein an improved stuing box and gland. This comprises a housing 110 about rod 7, the housing being threaded at`its outer end, as at 111, and here extends through the side' wall 112 of the closed ink 4chamber 5. lVithin the inner'end of housing 110 there is packing 113 about rod 7, and abutting the end of this packing is a sleeve 114. A cap nut 115.

threaded on theend of housing 110v bears against the outer end of .sleeve 114, whereby, by screwing this cap nut, the sleeve 114 may o be forced inwardly against the packing 113,'-

thus creating evenpressure on the-packing andv insuring aleak proof rotational mounting of the cylinder and housing 110 on vrod 7 -The stuiiing box cap 115 may be locked in adjusted position by means of a resilient bar 123 which is secured' to counterweight 107 and has a straight end disposed Aagainst a traight side of the cap. The bar being resilient may be bent away from' the cap when adjustment is to be made.

At the opposite side of the cylinder thel wall 1 has a bushing 116, and this walll is held in place on bracket 8 by means of a stub shaft 117 which may be locked in place by means of a set screw 118 which is threadved in bracket 8 and carries a locking lug 119 into and out an annular recess' 120 in shaft I117 to allow or to prevent disengagement of shaft 117 from cylinder wall 1 and the removal of the'- cylinder from its supports. Preferably a click spring 121 rests'against a knurled knob 122 of screw 118.

yIf desired, means may be provided for locking the cylinder against rotation and means may also -be providedv for locking the handle 12 against rotation to tip the ink trough 6. To this end an arm 125 is secured to frame 9, and has an end adjacent the tripper handle 12. This handle has an offset shoulder 126 which is arranged to come against arm 125 to prevent rotation of handle 12 to the left. A spring pressed latch 127 is'pivotally mounted on arm 125 and has a prong 128 which engages in a recess 129 in handle 12 .to revent turnin of lhandle 12 to tl1e right (il the ink. When it is desired to spill the ink latch 127 is retracted and the-ink trough tipped by manipulating handle 12.

The main object of locking the trough is to prevent accidental or inadvertant spilling of ink therefrom. With this arrangement,-

should a person or an object came in contact with handle 12, ink will not be spilled from the trough. However, thel operator may readily and easily .tip the trough to deliver ink to the diaphragm when he desires tov do `The lock for the cylinder` comprises a plunger 130 on arm 125 and a housing 131l securedto this arm.v A coil spring 132 urges the outer end of theY plunger, which ispreferably tipped with leather as at 133, against the cylinder .walL' 134 extending through a bayonet slot 135 in che side of housing 131 permitting the plunger tobe locked in retracted position. This lock for the cylinder serves several useful purposes. It holds the cylinder against -rotation when it is desired to remove or to attach a-stencil sheet or an ink pad without requiring the operator-to place ahand on the 'cylinder toprevent this rotation. The engagement being frictional, it permits the ig. 10) to spi l This plunger has a pin operator to rotate the cylinder into dier-- ent positions without releasing `the lock.

vWhen the machine is not in use, it is usually preferabletov position the @Zylinder so that the diaphragm. is uppermosty'jnl--which osition inkv drainsf.f 'iiito''the `ink trough 'wit in the sealed compartment. The lock maintains the cylinder in this adjusted position and prevents accidental displacement thereof.

In Figs. 14 and 15 there is shown a device for shielding the packing housing 110 from ink which drips downwardly. This device comprises a sheet metal box-like member 140, which yis U-shaped and attached in 1nverted position about the housing 110 and the adjacent portion rod 7. At one side shield 140 may have secured thereto a flange member 141, which establishes with the adjacent side wall of the member 140 a trouglr "seated in trough 6 and has flanges 146 secured thereto. The stop collar 147 and its set screw 148, which is mounted on shaft 7 to prevent inward movement of packing gland 110, is also preferably within cover 140. It will be apparent that ink dripping downwardly will flow around the top of the shield and around the trough 142 into the ink trough 6, and that this ink will be prevented from contacting the packing housing 110. In this manner the ink, V or the oily constituents thereof, are prevented from finding their Way into the packing 113.

As shown, the side walls 112 of the sealed ink compartment 5 havev inwardly directed edge flanges 150 on which vthe side edges of the diaphragm 3 rest. By providing registering perforations in these flanges 150I and the diaphragm, and filling the perforations with solder, the diaphragm may be conveniently secured to these flanges very securely. These members are thus keyed together by the solder, which will be exposed on `the outside o-f the diaphragm along its side edges, as at 151. The keys on opposite edges of the diaphragm may be so aligned that the line drawn between two opposite aligned 4keys across the diaphragmor a stencil thereon will establish a line which is exactly parallel with the axis of the cylinder. Thus, to ascertain whether or not the lines of printing on a stencil are parallel with the cylinder axis and will fall straight across the paper sheet to be printed, it is only necessary to place a straight edge across the stencil and in aliffnment'with two corresponding keys. If alignment is. not proper, it may be remedied by changing the ,angular adjustment of the stencil by manipulating screwsv 34, as before described. To aid in recognizing corresponding keys, the vflanges 100 of the cylinder walls 1 and 2 maybe provided with indicating scales, as at l153.

As many changes could be made in the above construction and as many apparently widely different embodiments of this invention could be made without departing from the scope thereof, itis-intended that all matter contained in thejfabove description orshown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

1. In a rotary stencil duplicating machine, in combination, a cylinderhaving a diaphragm, an ink,pad, attachment plates secured to each end of the pad, and means ad' justable'n the cylinder at each end of the diaphragmcngagcable with said attachment -`l`Lplates for securing the pad in place over thc diaphragm.

2. In a rotary stencil duplicating machine,

in combination, a cylinder having a diaphragm, an ink pad, attachment plates se-v cured to each end of the pad, and means adjustable on the cylinder at each end of thc diaphragm engagcable with said attachment plates for securing the pad in place over the diaphragm, said attachment plates being alike, and the said means at each end of the diaphragmbeing engageable with either plate, and the pad being reversible on the diaphragm.

In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, an ink pad, an attachment plate secured to one end of said pad, and means on the cylinder engageable with said plate for securing the pad to the cylinder, said plate having attachment perforations, and said means comprising pivoted lingers at one end of-the diaphragm engageable in said perforations.

4. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, an ink pad, an attachment plate secured to one end of said pad, and means on the cylinder engageable with said plate for securing the pad to the cylinder, said plate having attachment perforations, and said means including a pivotedimember at one end of the diaphragm having a hook engageable in one of said perfor-ations.

5. In a rotary stencil yduplicating machine, in combination, a cylinderl having a diaphragm, an ink pad, an attachment plate secured to one end of said pad, and means on the cylinder engageable with said plate for securing the pad to the cylinder, said plate having attachment perforations, and said means comprising pivoted devices at one end of the diaphragm, each having a series of hooks engageable selectively in one of said perforations.

6. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, an ink pad, an attachment plate .secured to one end of saidpad,n and means on the cylinder engageable with said plate for securing the pad to the cylinder, said plate having attachment perforations, arod at one end of the diaphragmconstituting av .nach having a series of hooks engageable sclectlvely 1n one of said perforatlons, the rear` inthe length of the pad.'

7. In a rotary stencil duplicating 1na'-l chine, in combination, a cylinder having a diaphragm, an ink pad, an attachment pla-te secured to one end of said pad, means on the cylinder engageable with said plate for securing the pad to the cylinder,and means mounted on said cylinder at one endet' the diaphragm and movable against the pad at one end of 'the diaphragm for preventing ink from passing from the pad onto the adjacent attachment plate.

8. In arotary stencil duplicating machine, in combination, a cylinder having a diaphragm, an ink pad, attachment plates secured to each end of the pad, means on the cylinderat each end ofthe diaphragm engageable with said attachment plates for securing the pad in place over the dia-v phragm, and means mounted on said cylinder at each end of the dia hrao'm and movh able againstV the pad at each end of the diaphragm for preventing ink from passing from the pad onto either of its said attach ment plates.

9. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, an ink pad, attachment plates secured to each end of the pad, and means on the cylinder at each end of, the diaphragm engageable with said attachment plates for securing the pad in place over the diaphragm, one of said plates being accessible to permit the pad to be engaged on or to be removed from the cylinder Without vrequiring the operator to touch any part of the pad but said plate.

10. An ink pad of the character described, comprising, in combination, a sheet of fabric,-and an attachment plate secured to the fabric at one end of the sheet, the edge of the sheet being interfolded with an edge of said plate, and said sheet Where it leaves said plate bearing against the rounded base of a fold in the plate, whereby the adjacent edges of the pad and plate are securely held together and the sheet is protected from being cut by the extreme edge of the plate.

'11. An ink pad of the character described, comprising, in combination, a sheet of fabric, and.an attachment plate secured to the fabric at one end of the sheet, said plate having attachment perforations and havinginclined odset guide channels immediately to the rear of said perforations.

l2. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, a stencilsheet having a button-V holed stub, buttons, engageable with said stub, and means for retaining said buttons i on said cylinder for adj ustmenttoward and from one end of said diaphragm, whereby the stencil sheet may be adjusted on said diaphragm.,- A

13. In a rotary stencil duplicating machine, in eon'ibination, a cylinder having a diaphragm, holed stub, buttons engageable with said stub, and means -for retaining said buttons on said cylinder for adjustment toward and a stencil sheethaving a buttonfrom 011e end of said diaphragm, whereby the stencil sli-eet may be adj usted on said diaphragm, said means including a cross-plate on which the buttons are carried, an armsecured on each end ot' said plate, a bracketixedly attached to the cylinder, adjacent each arm, and a Screw swiveled in each arm and threaded into the vadjacent bracket, whereby the arms and buttons may be adjusted in accordance with the adjustment of the screws on the brackets.

14. In 'a rotary stencil duplicating machine, in con'ibination, a cylinder having a diaphragm, a stencil sheet having a buttonholed stub, buttons engageable with said stub, and means for retaining said buttons on said cylinder for adjustment toward and from one end of said diaphragm, whereby the stencil sheet may bei-adjusted on said dia- 'f phragm, said means including across-'plate on which the buttons are carried, an arm secured on each end of said plate, a bracket ixcdly attached to the cylinder, adjacent each arm,and a. screw swiveled in each arm vholed stub, hooks engageable with said stub,

and means for retaining said buttons on said cylinder for adjustment toward and from -one end of said diaphragm, whereby the stencil sheetrmay be adjusted on said diaphragm, said means including a cross-plate on whlch the buttons are carried, an arm secured on each end of 'said` plate, a bracket ixedly attached to the cylinder, adjacent each arm, a screw swiveledin each arm and l threaded into the adjacent-bracket, whereby the arms and hooks may be' adjustedin accordance with the adjustment of the screws on the brackets, and a cross-bar secured to the cylinder and extending 'beneath said cross-plate, whereby said cross-plate is guided in its movements of adjustment.

16. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet having a' stub, means on the cylinder for engagin the stencil stub beyond an edge of the (Iiaphragm to hold the stencil on the cylinder, and means :tor clamping the stencil sheet against the adjacent edge of the diaphragm to relieve the strain between the stub and the stub-engaging means.

17. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet having a stub, mea-ns on the cylinder for engaging the stencil stub beyond an edge of the diaphragm to hold the stencil on the cylinder, and means :tor clamping the stencil sheet against the adjacent edge of the diaphragm to relieve the strain between the stub and-the stub engaging means, said clamping means presenting a knife edgeacross the stencil sheet along which the backing of the stencil sheet may be torn, whereby the removal of this backing is facilitated.

18. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet having a stub, means on the cylinder for engaging the stencil stub beyond an edge of the diaphragm lto hold the stencil on the cylinder, and means for clamping the stencil sheet against the adjacent edge of the diaphragm to relieve the strain between the stub and the stub engaging means, said clamping, means also constituting means for preventing ink from passing from the stencil shectkbeyond the point wherethe sheet is clamped against the diaphragm. i

19. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet having a stub, means on the cylinder for engaging the stencil stub beyond an edge of the diaphragm to hold the stencil on the cylinder, and means for clamping the stencil sheet againsty the adjacent edge of the diaphragm to relievei the strain between'the stub and the .stub ena gaging means, said clamping means includ-- ing a plate disposable edgewise tightly a-ganst an edge of the diaphragm, with the stencilsheetintermediate the said edges of the plate and diaphragm. 20. In a rotary stencilv duplicating machine, in combination, a cylinder having a diaphragm, al stencil sheet having a stub,

means on the cylinder forengaging the stencil stub beyond an -edge of the diaphragm to hold the stencil on the cylinder, and means for clamping the stencil sheet against the adjacent edge of the diaphragm to relievethe strain betweenthe stub and the stub engaging means, said clamping' means including a plate disposable edgewise tightly against anedgef the diaphragm, with the stencil sheet intermediate the said edges of the plate and diaphragm, said edges of the plate and diaphragm having complementary taper.

2l. In a rotary stencil duplicating niachine, in combination, a cylinder having a diaphragm, a st encil sheet having a stub, means on the cylinder for engaging the stencil stub beyond an edge of the diaphragm to hold the stencil on the cylinder, and means :for clamping the stencil sheet against the adjacent edge of the diaphragm to relieve the strain between the stub and the stub engaging means, said clamping means including a plate disposable cdgewise tightly against an edge ot' the diaphragm, with the stencil sheet intermediate the said edges of the'plate and diaphragm, said top surface of said plate being a slight amount above the stencil sheet.

22. In a rotary stencil Aduplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet having a stub, means engaging said stub beyond an edge of the diaphragm to hold the stencil on the cylinder, an arm pivotally carried on each side wall of the cylinder, a plate secured to said arms and having its forward edge presented toward savid edge of the diaphragm, a rod secured to and extending between said arms, and toggle means secured to said cylinder and to the center of said rod, whereby when said toggle means are extended said plate edge is clamped tightly against the said edge of the diaphragm with the stencil sheet intermediate said plate and diaphragm edges, and when said toggle means is broken said plate is Withdrawn from said diaphragm and said stencil stub is free to be disengaged from the stub engaging means.4

23. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet having a stub, means engaging said stub beyond an edge of the diaphragm to hold the stencil on the cylinder, an arm pivotally carried on each side Wall of the cylinder, a plate secured to said arms and having its forward edge presented toward said edge of the diaphragm, a rod secured to and extending between said arms, and toggle means secured to said cylinder and to the center of saidrod, whereby when said toggle means are extended said plate edge is l.clamped tightly. aga-inst the said edge of the diaphragm with the sten-'- cil sheet intermediate said plate and diaphragm edges, and when said toggle means is broken said-plate is withdrawn from said diaphragm and said stencil stub is free tov be disengaged from ,the stub engaging means, said rodbeing llexed when said toggle is eXtended.-.. whereby the plate edge is yieldingly held tightly against the diaphragm edge..

24. In a. rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet having a stub, means engaging said stub beyond an edge ot' the diaphragm to hold the stencil on the cylinder, an arm pivotally carried on each side wall of the cylinder, a plate secured to said arms and having its forward edge presented toward said edge of the diaphragm,

is broken said plate is withdrawn from said i diaphragm and said stencil stub is free to be disengaged from the stub engaging means, a lever pivoted on each cylinder wall, means for locking each lever in adjusted position, a pin on each lever located eccentrically of its pivot point, and said arms being pivotally mounted on said pins, whereby said arms and the plate carried thereby may be adjusted on the cylinder in response to pivotal adjustment of said levers.

25. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet having a stub, means on the cylinder for engaging the stencil stub beyond an edge of .the diaphragm to hold the stencil on the cylinder, and' means for clamping the stencil sheet against the adjacent edge of the diaphragm to ree lieve the strain `between the stub and the stub-engaging means. said stencil stub having attachment perforations, buttons secured beyond said diaphragm edge' and engageable in said perforations, and'means coacting with said clamping means for fore# ing said stub home on said buttons.

26. In. a rotarv stencil duplicating machine` in combination. a cvlinder having a diaphragm. a stencil sheet having a stub, means on the cvlinder for engaging the stencil stub bevond an edge of the diaphragm to hold the stencil on the cvlinder, and means for clamping the stencil sheet against the adiacent edge of the diaphragm to relievev the strain between the stub and the 'stubengaging means. said stencil stub having attachment nerforations. buttons secured bevond said diaphragm edge and engageable in saidnerforations, and means coaeting with said clamping means for forcing said stub home on said buttons` said clamping means including a plate movable edgewise against said diaphragm edge to clamp the stencil sheet between the plate and diaphragm. and said coacting means including to force the stencil stub home before the stencil sheet is clamped by said clamping lllealIS.

27. In a rotary stencil duplicating ma-` chine, in combination, a cylinder having a diaphragm, a stencil sheet disposable over the diaphragm, and means on the cylinder` for clamping the stencil sheet near its bottom edge tightly against the diaphragm.

28. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, astencil sheet disposable overthe diaphragm, and means on the cylinder for clamping the stencil sheet near its bottom edge tightly against the diaphragm, said *means including a plate movable on the cylinder into and out of overlapping position with respect to the stencil sheet when in place on the diaphragm.

29. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet disposable on the diaphragm, avplate movable on the cylinder into and out of overlapping position with respect to the lower portion of the stencil sheet when in place on the diaphragm, and means for-clamping said plate tightly downwardly against the stencil sheet and diaphragm.

30. In a rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet disposable on the diaphragm, a plate movable on the cylinder into and out of overlapping position with respect to the lower portion of the stencil sheet when in place on the diaphragm, and

means for clamping said plate tightly downwardly against the stencil sheet and diaphragm, said plate being mounted on a swinging pivotattached to the cylinder and said clamping meansincluding a toggle for rotating said plate on said swin ing pivot.

3l. In a rotary stencil dup icating machine, in combination, a cylinder having a diaphragm, a stencil sheet disposable on said diaphragm, a cross-member pivoted on said cylinder to swing toward and from one end of the diaphragm, a plate pivoted 4intermediate its front and rear edges on said cross-member and movable therewith into and out ofposition overlapping the stencil when in place on the diaphragm, a rod secured to the two side edges of said plate near its rear edge, and a toggle couple secured at one end to said rod and at its other end to said cylinder, whereby when said toggle is extended said plate isdisposed to overlap said stencil and is rotated on its swinging pivot-to firmly clamp downwardly on said stencil and diaphragm, and when sai'd toggle is collapsed said clamping pressure is released and said plate and its swinging pivot is withdrawn from said stencil and diaphragm.

32. In a rotary stencil duplicating machine, in combination, a cylinder having a lwhen in place on the diaphragm, a -rod near its rear edge, and a toggle couple secured at one'endtosaid rod and at its other end to. said cylinder, whereby when said toggle is extended said plateis disposed to overlap said stencil 'and lis rotated on its swinging pivot to firmly clamp downwardly on said stencil and diaphragm, and when said toggle is collapsed said clamping pressure is released and said plate and its swinging pivot 4is withdrawn from said stencil and diaphragm, and spring means engaging said rod and cross-member for urging said pivot and plate toward the diaphragm. f

33. In ya rotary stencil duplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet disposable on said `diaphragm, a cross-member pivoted on said cylinder to swing toward and from one end of the diaphragm, a plate apivoted inter-v mediate its front and rear edges on said cross-member and movable therewith into and out -of position overlapping the stencil when in place on the diaphragm,a rod secured-v to the two side edged of said plate near its rear edge, and a toggle couple secured at ,one end to said rod and at its other end to said cylinder, whereby when said `toggle is extended said plate is disposed to overlap said stencil and is rotated on its swinging pivot to lirmly clamp downwardly on said stencil and.diaphragm, and when said toggle is collapsed said clamping pressure is released and said plate' and its swing-` ing pivot is withdrawn `from said stencil and diaphragm, a roller movable with said'` cross-member and plate, and a: guide member for said roller secured to a wall of said cylinder. l

34. In a rotary stencil 'duplicating machine, in combination, a cylinder having a diaphragm, a stencil sheet disposable on said diaphragm, a cross-memberpivoted on said cylinder to swing toward and from one l-end of thediaphragm, a plate pivoted intermediate its front and rear edges on said cross-member and movable therewith into and out of position overlapping the stencil when in 'place on the diaphragm, a rod secured to the two side edges of said plate near its rear edge, and a toggle couple secured at one end to said rod and at its other end to saidcylinder, whereby when said toggleuisextended said plate is disposed tol overlapwsaid-*stencil and is rotated on its" swinging-'pivot-to firmly clamp downward ly on saidstencil and diaphragm, and when A said toggle is collapsed said clamping pressure is released and said plate and its swinging pivot is withdrawn from said stencil and diaphragm, and spring means engaging said rod and cross-member for urging saidv pivotand plate toward the diaphragm, a roller movable with said cross-member and plate, a guide-member. for said roller secured to a wall of `said cylinder, and a` depression rearwardly on said guide member in the path of said roller'and constituting means for arresting said roller vto hold said cross-member and plate in retracted position against the action of said spring.

'35. In a rotary stencil duplicating machine, Va cylinder having circular walls flanged inwardly at their edges, a diaphragm on said cylinder, a separate stencil clamping assembly extending between the cylinder walls and beneath said wall flanges, portions of said flanges being cut away to permitthe' mounting of the stencil clamping assembly on the cylinder. A

36. In a rotary stencil duplicating machine, a cylinder having circular walls flanged inwardly at their edges, a diaphragm on said cylinder, ya separate stencil 37. In a rotary stencil duplicating machine, a cylinder having circular walls flanged inwardly at their edges, a diaphragm on said cylinder, a separate stencil clamping assembly extending between the cylinder walls and beneath said wall flanges, portions ofsaid flanges being cut away to permit the mounting of the stencil clamping assembly on the cylinder, and separate insert members secured to the cylinder walls at said cut away portions, one of said insert members including an adjustable drive pin device.

38. In a rotary stencil duplicating machine, la cylinder havin circular walls flanged inwardly at their edges, a diaphragm on said cylinder, a separate stencil clamping assembly extending between the cylinder walls and beneath said wall flanges, portions of said flanges being cut away to permit the mounting of the stencil clamping assembly onthe'cylindenvand separate -insert members secured to the cylinder walls at said cut away portions, one of said insert ERNEST J. BnAssEUR.'- 

